The One-Year Mission focused on seven categories of research. In March 2015, American Astronaut Scott Kelly and Russian Cosmonaut Mikhail Kornienko began collaborative investigations on the International Space Station (ISS). They will reside on the ISS for a year, which is twice as long as typical U.S. missions. These investigations are expected to yield beneficial knowledge on the medical, psychological and biomedical challenges faced by astronauts during long-duration spaceflight.